Enantioselective Carbometalation of Cinnamyl Derivatives: New Access to Chiral Disubstituted Cyclopropanes— Configurational Stability of Benzylic Organozinc Halides
Polar selectivity of carbene addition to 3-substituted propenes
作者:Toshihiko Migita、Kiyoshi Kurino、Wataru Ando
DOI:10.1039/p29770001094
日期:——
Relative rate constant for the addition of several carbenes to a series of allylic compounds have been determined by means of competititive experiments. These results and derived Hammett–Taft parameters show that polarselectivities of carbenes are generally low, but correlate with the polar natures of the carbene substituents. The selectivity of a singlet carbene was even lower than that of the corresponding
A fluorous phase approach to rhodium-catalyzed carbenoid reactions with diazoacetates
作者:Andreas Endres、Gerhard Maas
DOI:10.1016/s0040-4039(99)01332-5
日期:1999.8
The cyclopropanation of alkenes with methyl diazoacetate in dichloromethane was catalyzed by rhodium(II) carboxylates containing a perfluoralkyl chain (Rh2L4, L = OOCC7F15 and OOC-C6H4-4-C6F13) The catalysts could be extracted into perfluoro(methylcyclohexane) and were reused several times without significant loss of activity. The same catalysts were used to achieve carbene transfer to toluene in the solvent system toluene-perfluoro(methylcyclohexane) at 60 degrees C. (C) 1999 Elsevier Science Ltd. All rights reserved.
ROUSSEAU, G.;SLOUGUI, N., J. AMER. CHEM. SOC., 1984, 106, N 23, 7283-7285